<!--
 * @Description: 
 * @Author: zwx
 * @Date: 2024-11-11 15:08:40
 * @LastEditors: zwx
 * @LastEditTime: 2024-11-11 15:33:37
 * @又活了一天: 你真厉害！！！
-->
<!DOCTYPE html>
 <html lang="en">
 <head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial
scale=1.0">
     <title>14-DOM课堂练习</title>
 </head>

 <body>
     <img id="h1" src="off.gif">  <br><br>
     <div class="cls">杰普软件</div>   <br>
     <div class="cls">Java程序员</div>  <br>
     <input type="checkbox" name="hobby"> 电影
     <input type="checkbox" name="hobby"> 旅游
     <input type="checkbox" name="hobby"> 游戏
</body>
<script>
    //1. 点亮灯泡 : src 属性值
   //首先获取img标签对象
   var img = document.getElementById('h1');
    //然后修改img标签对象的src属性值，进行图片的切换
   img.src = "on.gif";
    //2. 将所有div标签的内容后面加上: very good (红色字体) -- <font color='red'></font>
    var divs = document.getElementsByTagName('div');
    for (let i = 0; i < divs.length; i++) {
    const div = divs[i];
    div.innerHTML += " <font color='red'>very good</font>"; 
   }
    // //3. 使所有的复选框呈现选中状态
   var ins = document.getElementsByName('hobby');
    for (let i = 0; i < ins.length; i++) {
    const check = ins[i];
    check.checked = true;//选中
   }
    </script>
    </html>